Sdu26 Plastic Dowel

The SDU26 is a high-performance variant within the rail plastic sleeve family. Functioning as the embedded structural foundation of a track assembly, it is engineered explicitly to meet the requirements of the globally recognized Vossloh W14 (SKL) rail fastening system. Pre-inserted individually into concrete or wooden sleeper ties during initial tie manufacturing, it acts as a threaded socket to receive heavy-duty sleeper screw spikes (such as the DHS 24x161 series).

Key Technical Performance Indicators

The SDU26 is designed to withstand extreme mechanical loads and environmental demands, complying with international tracking standards like DIN EN 13481-2:

· Vertical Loading Resistance: Capable of sustaining vertical loads of ≥ 60 kN on cast and bonded fastening components.

· Mechanical Pulling Strength: Ensures a minimum pulling resistance threshold of ≥ 75 kN to prevent the assembly from ripping out under intense dynamic train loads.

· Surface Tolerance: Molded with a highly uniform, smooth thread surface free from structural defects. This design allows the screw spike to be uninstalled from the sleeper for maintenance without fracturing or breaking the concrete tie.

Material Options & Specifications

Depending on whether the railway line handles standard metro transit or heavy-haul cargo, the SDU26 is manufactured by top-tier suppliers using two primary engineering polymers:

1. Glass-Fiber Reinforced Nylon 6 / 66 (PA6 / PA66 + GF30%)

This composition is deployed on high-speed lines requiring rigid structural resilience. It is specially treated with anti-ultraviolet and anti-oxidation additives.

· Density: 1.12 – 1.14 g/cm³ (per DIN EN ISO 1183-1)

· Tensile Strength: ≥ 55 MPa

· Flexural (Bending) Strength: ≥ 65 MPa

· Flexural Modulus: ≥ 2000 MPa

2. High-Density Polyethylene (HDPE)

Preferred for environments prioritizing superior moisture barriers and cost-effective flexibility.

· Density: 0.95 – 0.98 g/cm³

· Tensile Strength: ≥ 19 MPa

· Insulation Resistance: ≥ 1×10¹⁰ Ω

Global Sourcing & Customization by Signum Rail Fasteners

For project procurement managers looking to source these components, Signum Rail Fasteners supplies high-quality plastic dowels engineered to match your explicit design footprints.

· Premium Performance: Every SDU26 unit supplied by Signum Rail ensures maximum pull-out resistance, long-term vibration dampening, and rigorous electrical insulation across high-speed and heavy-haul transit lines.

· Bespoke Manufacturing: Signum can customize plastic dowels for rail fastening systems according to clients' requirements. Whether your construction blueprints require specialized High-Density Polyethylene (HDPE), glass-fiber reinforced Nylon (PA66 + 30% GF), modified lengths, or non-standard thread pitches, Signum Rail can manufacture parts directly from your custom technical drawings or physical samples.